一、引言 异型螺杆在空压机及制冷压缩机、工业螺杆泵、塑料机械、食品机械、制药机械等产品中的应用非常广泛。目前常用的异型螺杆加工方法有成型车削、成型铣削、旋风式铣削、包络铣削等，但大多数的加工方法局限于加工变距、变径螺杆。 如图１所示的螺杆（其截面数据见表１ I. Introduction Shaped screw in the air compressor and refrigeration compressors, industrial screw pumps, plastic machinery, food machinery, pharmaceutical machinery and other products is widely used. At present, commonly used special-shaped screw machining methods include forming turning, forming milling, whirlwind milling, envelope milling, etc. However, most of the processing methods are limited to processing variable pitch and variable-diameter screws. Screw shown in Figure 1 (the cross-section data in Table 1